Kelsey Plum scored 14, Aminah Williams grabbed 14 rebounds and the Huskies (12-9, 5-5 Pac-12) outshot the Trojans 37.9 percent to 31.8 percent. The Trojans out-rebounded the Huskies 49-35, but Washington shot 8 of 21 from distance to just 4 of 23 for USC.
Washington jumped to a 10-0 lead and finished with a 9-2 run to lead 31-17 at halftime. Davis scored nine points in the half and had four assists.
USC used a 9-2 run in the second half to close to 37-28, then made it a five-point game on a jumper by Cassie Harberts. But Washington kept the Trojans at arm's length, finishing on a 9-2 run.
Harberts led USC (14-9, 7-4) with 22 and 11 rebounds, Ariya Crook scored 11, and Brianna Barrett had 10 boards.